Posts tagged ‘Rubidium Standard’

Jitter Measurement of the Pulse Width Expanded 1PPS Output

In my previous blog posts, I did a teardown of the Symmetricom/Datum 8040 Rubidium frequency standard and modified the 1PPS output by expanding the pulse width from just around 10µs to roughly 50% duty cycle. There were some questions regarding the clock jitter introduced by the 555 monostable circuit. So let’s take a more detailed look in this post. Continue reading ‘Jitter Measurement of the Pulse Width Expanded 1PPS Output’ »

Datum/Symmetricom 8040 Rubidium Frequency Standard Teardown

I finally got my hands on a Rubidium frequency standard. I have been wanting to get one of these for my lab for quite some time now but have not encountered a good one at a reasonable price. Most rubidium oscillator modules on the second hand market these days come from decommissioned equipment used in cell towers. A good used lab grade rubidium standard is even more expensive. Continue reading ‘Datum/Symmetricom 8040 Rubidium Frequency Standard Teardown’ »